chore: import upstream snapshot with attribution

doc/source/serve/doc_code/fault_tolerance/sleepy_pid.py

@@ -0,0 +1,23 @@
+# flake8: noqa
+
+# __start__
+# File name: sleepy_pid.py
+
+from ray import serve
+
+
+@serve.deployment
+class SleepyPid:
+    def __init__(self):
+        import time
+
+        time.sleep(10)
+
+    def __call__(self) -> int:
+        import os
+
+        return os.getpid()
+
+
+app = SleepyPid.bind()
+# __end__